Cutting and sawing device



July 22 1924.

V. V. COLBY CUTTING AND SAWING DEVICE Filed Feb. 1

192] 2 $heets$heet 1 Jul 22 1924.

r V. V. COLBY CUTTING AND SAWING DEVICE 2 Sheets-Sheet 2 1 c fW /jj.

Patented July 22, 1924.

UNITED STATES PATENT OFFICE."

VINCENT V. COLBY, OF CHICAGO, ILLINOIS, ASSIGNOB TO CHARLES A. BROWN, 01 HINSDALE, ILLINOIS.

CUTTING AND SAWING DEVICE.

To all whom it may concern:

Be it known that I, VINonN'r V. CoLBY, a citizen of the United States of America, and a resident'of Chicago, county of Cook,

and State of Illinois, have invented certain new and useful Improvements in Cutting and Sawing Devices, of which the following is a specification.

This invention relates to mechanism for operating reciprocating tools such as knives or saws, and is useful for cutting out patterns of wood, metal or other material, and for doing much of the work which is ordinarily effected by means of band-saws and scroll-saws.

The purpose of the invention is to provide a sawing or cut-ting device by means of which kinds of work ordinarily done by band-saws and the like are greatly facilitated.

This object is accomplished by the device shown in the accompanying drawings, in which Figure 1 shows in side elevation and part- 2 ly in section a motor equipped in accordance with the present improvement.

Figure 2 is a sectional detail on the line 22 of Figure 1.

Figure 3 is a fragmentary detail partly in section illustrating the manner in which the tool extends through the table; and

Figure 4 is a perspective view of the table top showing the tool protruding therethrough.

gs The design shown in the drawings relates to improved means for operatin reciprocating tools and consists preferab y of an electric motor having a connection for reciprocating a tool holder, a tool in this holder being supported eccentrically so that it not only reciprocates with the holder but is free to swing around a center eccentric with respect to the axis of the tool. The device is also provided with a supportin at which is journaled a circular plate having an aperture at one side and through which the tool projects. This plate serves as a support for articles which are cut by the tool, and the plate may swing freely with the tool around the eccentric support therefor.

Referring to the drawings, the motor 1 is shown as having its shaft 2 provided with a crank or eccentric 3 upon which is journaled 6!; an internal gear 4. This gear meshes with 11 integral'with the motor frame.

an external gear 5 fixed to the motor frame. The gear 5 has half the pitch diameter as the gear 4, and accordingly there is a two to one reduction between the motor shaft 2 and gear 4. The pitman 6 is journaled eccentrically on gear 4 and serves to transmit motlon from the gear to a reciprocating bar 8 which has a pin 9 on its head 10. The upper end of pitman 6 is journaled on the pin 9. Bar 8 is guided in the vertical bearin The too 12 is clamped in a holder 13 eccentric to the axis of bar 8 on which at its lower reduced end 14 the holder 13 is journaled. The tool is therefore free to swing around the axis of reciprocating rod 8, and the feet 15 of the motor frame, as shown in Figure 2, are so desi ed as to not interfere E:vith circular motion of the tool around r0 The motor with its tool as described is inverted and fixed below a support which is provided with a circular guide for the tool and support for the work which is concentric with the axis of rod 8, this guide being free to turn around its axis with the tool as it swings around its eccentric support. Ac-

, cordingly,- the device may be mounted on the lower surface of the lid 17 of the boxlike structure 21 shown in Figure 4. The tool 12 in this view is shown as projecting upwardly through a key-hole-shaped aperture 18 in one side of a circular plate 19 journaled in the metal plate 20 forming part of lid 17.

In the operation of the device the tool is reciprocated and is likewise free to swing around its journal 14 according to the direction of pressure between the tool and the article operated upon. When so swung around its journal, plate 19 rotates with the tool but irrespective of this rotary motion of the plate, this circular plate with the lid 17 forms a flush surface over which the article operated upon may be moved in any direction, the tool always cutting directly against the line of motion and never being subject to breakage due to lateral pressure.

Since the tool is free ended, it will be clear that in making an inside out, as in mortising, the stock, with a preliminary drilled hole, may; be quickly set over the sameand simply moved againstit in the direction opposing the desired direction of cut, with full vision, until the mortise is com leted, whereupon the stock may he quite ly lii'ted ewey from the sow.

ll cloim:

1. In eidevice of the class described, e reei roosting member, 2t support carried. by sei meinher end mounted'thereonto rotate about on axis parallel to the reciprocation oi seid mernher, e tree-ended sew with teeth in sumtentielly n strei ht line mounted on said support with the line oi its teeth persllel to end distanced from said axis, as tohle and e disk mounted flush with said table and rotatable on said axis and having a slot therein throu h which seid saw extends, su'd disc beingee to rotate by said suvv turning with said rotetuble support.

2. in e device of the class described, a table, a sow extending through said table and having its upper end free, means for supporting said sew below said table, and means tor operating said saw and permitting said saw to follow the Work automatically in substantially any direction.

3. in adevice of the class described, a table, it saw extending through said telole and having its upper end tree, means for supporting said sew below said table, and

neoense moons ton operating soid sew, seid support i ling Irnenns swinging on on exis distanced from said sew en the work by its pressure theresgeinst.

Itn combination, at table, a, rotstelole disc in seid table, said disc heving en eper ture therethrough ofiset from the eris of rotation, e support below said tehle pit open ng, a free-ended saw on seid support passing through said opening and otiset from the axis of rotation of said support, and means tor reci rooetin seid support and saw substantially perel oi rotation of said support.

Signed at Chicago this 11th day of Feb. 1921.

VINCENT V. CULBY,

moving said saw to follow elto the axis 

